Japanese for Busy People: Vol 1 (Japanese for Busy People)
Japanese for Busy People: Kana Version Vol 1 (Japanese for Busy People)
Japanese for Busy People: Kana Workbook Vol 1 (Japanese for Busy People)
Japanese for Busy People - The Workbook

What is the different between Vol1 and Kana Version Vol1. And the two different workbooks?

the kana workbook is something different than the regular workbook. The kana workbook is just that--a workbook to help you learn kana. I ordered this by mistake, thinking it was the kana version of the workbook, but it isn't. It will work out as a good review and vocabulary, but it appears if you want a workbook to go along with either version of the textbook, there is only one.